Invisible baby turtles on mud blocks

When a baby turtle goes onto a mud block that has water on top the turtle will turn invisible. it still grows up so it isnt despawning.

What I expected to happen was...:
to see the baby turtle in the water

What actually happened was...:
turtle turned invisible due to the slightly smaller block and mob (mud block and baby turtle)

Steps to Reproduce:
1. put a layer of water
2. replace the ground with mud blocks
3. put a baby turtle in the water